/Engine/Source/Editor/MaterialEditor/Public/MaterialEditingLibrary.h
Returns the path of the asset where the parameter originated, as well as true/false if it was found
Whether or not the parameter was found in this material
static bool GetStaticSwitchParameterSource ( [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * Material, const [FName](API\Runtime\Core\UObject\FName) ParameterName, [FSoftObjectPath](API\Runtime\CoreUObject\UObject\FSoftObjectPath) & ParameterSource )